<template>
  <div>
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">权限管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card >
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
        <!-- 角色列表区域 -->
        <el-table :data="rolelist" class="eltable" border stripe>
          <!-- 展开列 -->
          <el-table-column type="expand" label="">
            <template slot-scope="scope">
              <el-row
                :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                v-for="(item1, i1) in scope.row.children"
                :key="item1.id"
              >
                <!-- 渲染一级权限 -->
                <el-col :span="5">
                  <el-tag
                    closable
                    @close="removeRightById(scope.row, item1.id)"
                    >{{ item1.authName }}</el-tag
                  >
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 渲染二级和三级权限 -->
                <el-col :span="19">
                  <!-- 通过for循环，嵌套渲染二级权限 -->
                  <el-row
                    :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                    v-for="(item2, i2) in item1.children"
                    :key="item2.id"
                  >
                    <!-- 二级权限 -->
                    <el-col :span="6">
                      <el-tag
                        type="success"
                        closable
                        @close="removeRightById(scope.row, item2.id)"
                        >{{ item2.authName }}</el-tag
                      >
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 三级权限 -->
                    <el-col :span="18">
                      <el-tag
                        type="warning"
                        v-for="(item3, i3) in item2.children"
                        :key="item3.id"
                        closable
                        @close="removeRightById(scope.row, item3.id)"
                        >{{ item3.authName }}
                      </el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type="index" label="#"> </el-table-column>
          <el-table-column label="角色名称" prop="roleName"> </el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"> </el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit"
                >编辑</el-button
              >
              <el-button size="mini" type="danger" icon="el-icon-delete"
                >删除</el-button
              >
              <el-button
                size="mini"
                type="warning"
                icon="el-icon-setting"
                @click="showSetRightDialog(scope.row)"
                >分配权限</el-button
              >
            </template>
          </el-table-column>
        </el-table>
      </el-row>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树型控件 -->
      <el-tree
        :data="rightlist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 所有权限列表数据
      rightlist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: "authName",
        children: "children"
      },
      // 默认选中的节点id值数组
      defKeys: [],
      roleId: "",
      // 控制分配角色对话框的显示与隐藏
      setRightDialogVisible: false
    };
  },
  created() {
    this.getRoleList();
  },
  methods: {
    //   获取所有角色的列表
    async getRoleList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取角色列表失败");
      }
      this.rolelist = res.data;
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      //  弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        "此操作将永久删除该文件, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("取消了删除操作");
      }
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      );
      if (res.meta.status !== 200) {
        this.$message.error("删除权限失败");
      }
      this.$message.success("删除权限成功");
      // this.getRoleList();
      role.children = res.data;
    },
    //  展示分配角色的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id;
      // 获取所有权限的数据
      const { data: res } = await this.$http.get("rights/tree");
      if (res.meta.status !== 200) {
        return this.$message.error("获取权限数据失败");
      }
      this.rightlist = res.data;
      //递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys);
      this.setRightDialogVisible = true;
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到defkeys的数组中
    getLeafKeys(node, arr) {
      // 如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id);
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr);
      });
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = [];
    },
    //点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ];
      const idstr = keys.join(",");
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idstr }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("设置权限失败");
      }
      this.$message.success("设置权限成功");
      this.getRoleList();
      this.setRightDialogVisible = false;
    }
  }
};
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
.eltable{
  margin-top: 15px;
}
</style>
